Correct option is (a) erythrocytes
Graft rejection does not involve erythrocytes. Transplant or graft rejection occurs when transplanted tissue is rejected by the recipient’s immune system, which destroys the transplanted tissue. Rejection is an adaptive immune response via cellular immunity (mediated by killer T-cells), macrophages and polymorphonuclear leukocytes (i.e., neutrophils, eosinophils and basophils).
